Scared Silly
Contributor
BITD some were made from 3/4-14 NPS valves. Very rare to find them, I have not seen one but have heard of their existence from a folks who have seen them.
3500psi valve from DIN to yoke?
- Thread starter novasquid
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BITD some were made from 3/4-14 NPS valves. Very rare to find them, I have not seen one but have heard of their existence from a folks who have seen them.
OP
novasquid
Contributor
How about using a DIN fill adapter?
http://www.divegearexpress.com/gas/cylacc.shtml
http://www.divegearexpress.com/gas/cylacc.shtml
In my understanding, a DIN 300 rated 1st stage, will fit in any DIN valve. A DIN 200 rated 1st stage will NOT work with a DIN 300 rated valve. (It will be 2 threads short of a seal)
You cannot put a 200Bar valve on a 300Bar tank.
You may get yokeadapters for ALL DIN 1st stages. However, you cannot get an adapter for a Yoke1st stage to fit on a DIN 300 valve.
You cannot put a 200Bar valve on a 300Bar tank.
You may get yokeadapters for ALL DIN 1st stages. However, you cannot get an adapter for a Yoke1st stage to fit on a DIN 300 valve.
Perhaps I am missing something you are trying to say here? "You cannot put a 200Bar valve on a 300Bar tank" Do you mean that you cannot fit a 200BAR "valve" into a 300 BAR cylinder? Are not the 200 BAR and 300 BAR cylinders the same neck thread? Lets say Faber steels. Are not all (lets say for the discussion) Faber cylinders the same neck thread (3/4 NPS 14TPI)? I looked at the Faber site but didn't see anything there to clear this up. I have 12.2 litre Faber 232 BAR cylinders which clearly state OP 232. They have 3/4 NPS 14TPI neck threads.
Now perhaps one shouldn't, but I am assuming that it physically can be done? Perhaps someone with HP Faber tanks can let us know what their cylinders state regarding neck threads?
Scared Silly
Contributor
Cylinders with a rated pressure of 3500psi or more required a 7/8-14 UNF threaded valve. That valve is a 7 thread DIN valve (300 bar only). Cylinders with a rated pressure of less than 3500 psi such as the 3442 psi (237 bar) cylinders have a 3/4-14 NPS threads. That valve can be yoke, 5 thread DIN (200 bar), or 7 thread DIN (300 Bar). That is the standard at least here in the North America. Probably similar in other parts of the world.
At this point to my knowledge no one is making the 3500 psi cylinders any longer. They are all 3442 psi or below.
At this point to my knowledge no one is making the 3500 psi cylinders any longer. They are all 3442 psi or below.
Bob DBF
Contributor
My understanding is that the tank/valve threads are different on 300 bar cylinders to prevent the use of 200 bar equipment on 300 bar service, and the excitement which may ensue. I believe 300 bar valves are 7/8" threads rather than 3/4" to avoid problems.
Bob
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Always use the right tool for the job. A hammer is the right tool for any job. Anything can be used as a hammer.
Ok thanks guys. Something else I just learned then. I searched all the tank sites and nothing mentioned this, however I sort of figured it would be a good idea to have this, because if someone can use something that will explode then they will.
That's why we need these forums, as a learning exercise.
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